Term
| which of the following are true about the oribits of population I stars is true |
|
Definition
are randomly inclined to the disk of the galaxy
and are primarly confined to the disk of the galaxy |
|
|
Term
| the center of our galaxy lies in the direction of the constellation of |
|
Definition
|
|
Term
| the chemical abundance of population I stars |
|
Definition
| indicates that the material they formed from had been enriched with material from supernovae |
|
|
Term
|
Definition
Are primarly old stars
Are primarily found in globular clusters and the core |
|
|
Term
| Population I stars have more heavy elements because |
|
Definition
| they heavy elements were made in previous generations of stars |
|
|
Term
| which of the following is not a characteristic of the stars of the disk component of our galaxy |
|
Definition
|
|
Term
| generally speaking elliptical galaxies contain which type of stars |
|
Definition
| mostly lower main sequence stars and giants |
|
|
Term
| generally speaking a spiral galaxy contains which type of stars |
|
Definition
| both upper and lower main sequence stars |
|
|
Term
| of the following distances which is equivalent to Megaparsec |
|
Definition
1,000,000 parsecs
and 3,260,000 light-years |
|
|
Term
| which of the following is not used to measure distance to celestial bodies |
|
Definition
all are used
radar
lasers
tully-fisher relationship
cepheid variable stars |
|
|
Term
| the mass of a single galaxy may be found by applying which of the following methods |
|
Definition
| the rotation curve method |
|
|
Term
| hubble galaxy classification diagram is shown. Which of the labeled figures above represents an Sc galaxy |
|
Definition
|
|
Term
| hubble galaxy classification diagram is shown. Which of the labeled figures above represents an SBa galaxy |
|
Definition
|
|
Term
| hubble galaxy classification diagram is shown. Which of the labeled figures above represents an elliptical galaxy |
|
Definition
|
|
Term
| If you have an elliptical galaxy that appears to be perfectly circular, what type of galaxy would you classify it as |
|
Definition
|
|
Term
| Astronomers believe a galaxy's shape depends on all of the following ExCEPT |
|
Definition
| the chemical elemental composition |
|
|
Term
| Which irregular galaxy is believed to have already collided with the Milky Way in the past and is expected to merge with the Milky Way in the Future |
|
Definition
| The Small Magellanic Cloud |
|
|
Term
| observation of galaxies and clusters of galaxies indicate that approximately what percentage of matter in the universe is dark matter |
|
Definition
|
|
Term
| Which of the following are characteristics of radio lobes |
|
Definition
| they are created by jets from the galaxy |
|
|
Term
| Radio lobes radiate synchronotron radiation. this indicates that |
|
Definition
| high speed electrons are spiraling through a magnetic field |
|
|
Term
| whihc of the following is true about the nature of quasars |
|
Definition
| quasars must be very luminous |
|
|
Term
| which of the following provides scientists with evidence that the energy source of quasars must be relatively small (compared to the size of a galaxy) |
|
Definition
| quasars' brightness fluctuate rapidly |
|
|
Term
| ____is observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form tow or more images of the same quasar |
|
Definition
| gravitational lens effect |
|
|
Term
| the resolution of Olbers' paradox suggests that it gets dark at night because |
|
Definition
The universe is not infinite in age
and
the universe is not static |
|
|
Term
| Isotropy is defined as a characteristic of the universe in which |
|
Definition
| the universe looks the same in all directions |
|
|
Term
| homogeneity is defined as a characteristic of the universe in which |
|
Definition
| the universe looks the same from all locations over sufficiently great distances |
|
|
Term
| Hubble's law is a plot of what tow parameters of galaxies |
|
Definition
| recessional velocity vs. distance |
|
|
Term
| If galaxy A is 16 times more distant than galaxy b, then according to the hubble law, galaxy a will recede at a velocity_________than galaxy b |
|
Definition
|
|
Term
| In the following diagram, the depiction on the left can be considered to be |
|
Definition
| homogeneous, but not isotropic |
|
|
Term
| In the following diagram, the depiction on the RIGHT can be considered to be |
|
Definition
| isotropic, but not homogeneous |
|
|
Term
| The cosmic background radiation comes from a time in the evolution of the universe |
|
Definition
| when electrons began to recombine with nuclei to form atoms |
|
|
Term
| the center of the universe, the site of the big bang |
|
Definition
| is not at any one location in our physical universe |
|
|
Term
| The Stefan-Boltzmann law relates which two properties of an object |
|
Definition
| temperature and energy radiated |
|
|
Term
| two objects are moving closer together. Each will see the other's light |
|
Definition
|
|
Term
| You take an object and move it three times the distance that it was from a light source. The amount of light that the object will now receive from the source is |
|
Definition
|
|
Term
| the representation of gravity as a curvature of space similar to a flexible rubber sheet was first expressed in |
|
Definition
| Einstein's General Theory of Relativity |
|
|
Term
| within what era of the big bang are we now living |
|
Definition
|
|
Term
| in what era was the universe was dominated by all portions of the electromagnetic spectrum |
|
Definition
|
|
Term
given the above geometric possibilities of the universe, within which geometry do triangles contain less than 180 degrees
1. closed
2. open
3. flat |
|
Definition
|
|
Term
within which geometries will two parallel beam s of light never meet
1. closed
2. open
3. flat |
|
Definition
|
|
Term
| the grand unification theories allow for the combining of the following forces |
|
Definition
|
|
Term
| protons and neutrons, both known as nucleons are made up of what particles |
|
Definition
|
|
Term
| the inflationary cosmological model |
|
Definition
| helps explain why the backgrounds radiation is so nearly the same in all directions |
|
|
Term
| the nebular condensation model of the formation of the solar system suggests that ___ should condense closest to the sun |
|
Definition
|
|
Term
| the greenhouse effect occurs because |
|
Definition
| carbon dioxide is transparent to visible light and opaque to infrared radiation |
|
|
Term
| life on earth is based on |
|
Definition
|
|
Term
| evidence for organioc molecules has already been discovered where |
|
Definition
|
|
Term
| the drake equation allows us to estimate |
|
Definition
| the number of intelligent civilizations in our galaxy |
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|
